Steel pitman



Jan. 24, 1928.

B. BOYKIN. JR

STEEL PITMAN Filed June 16, 1924 2 Sheets-Sheet l gwvemtov w f w,

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- Patented 111.24. 1928.

BURWELL BOYKIN, JR.,

OF BEAUMONT, TEXAS.

STEEL PI'IMAN.

\ Application filed June 16, 1924. Serial No. 720,273.

My invention relates to the construction of a steel or other metallic pitman, particularly adapted for use in pumping installations for connecting the crank arm to the walking beam.

It is an object of the invention to construct a pitman which will be strong and durable and in which the bearing parts are easily renewable when worn.

It is another object to construct a pumping pitman which may be manufactured cheaply and economically and be easily installed on plants now in operation.

Referring to the drawing wherein a preferred embodiment of my invention is shown, Fig. 1 is a side elevation of a pumping plant employing my invention. Fig. 2 is broken upper end. of the pitman, certain parts being broken away for greater clearness. Fig. 3 is a transverse section on line 33 of Fig. 2. Fig. a is a longitudinal section on the line 44 of Fig. 6. Fig. 5 is a broken side elevation of the lower end of the pitman. Fig. 6 is a front elevation of the lower end of the pitman; and Fig. 7 is a longitudinal section on the line 77 of Fig. 5. vLike numerals of reference are applied to like parts in all the views.

Although my invention is not limited for use exclusively in pumping, I have shown it as employed to connect a crank shaft 2 to the rear end 3 of a walking beam. The main body 4 of the pitman is preferably made of a length of channel iron of I-beam construction there being two parallel plates 5 connected by a central web 6.

The upper end of the pitman comprises a stirrup or yoke 7 of the usual form adapted to fit over the end of the walking beam. The lower ends of the yoke are bent inwardly and secured to opposite sides of the central web 6 of the pitman rod by bolts 8. The said yoke ends are spaced from said web 6 by spacing blocks 9 through which the bolts 8 pass.

The lower end of the pitman comprises a bearing member adapted to be attached to the crank pin 2. There is a head 10 on the bearing member the upper end of which is reduced in width to fit between the side plates 5 of the pitman rod and has a central longitudinal slot 11 therein to rece1ve the web 6. Bolts 12 extending transversely through the pitman and said head secure them together.

arm 1 on the The head 10 is cut out centrally to form a housing to receive the bearings. It has a central web 6 on its outer periphery to strengthen the same. The housing has an upper brass bearing member 13 fitting in the lower face of a block 14. slidable laterally into said housing. Said block has an oil chamber 15 above the hearing from which a slot 16 in the bearing allows passage of oil tothe crank pin. cupped lip 17 serves as an oil cup and also as a handle in moving the block 14:.

Said block is locked in position by means of a key 18 fitting through an opening 19 in the head 10 block 14 as shown. A set screw 21 serves to lock said key against removal.

The lower brass bearing 22 fits in the upper face of a lower block 23 seating in said housing. 24: thereon which extend downwardly and fit in notches or recesses 25 cut in the housing. Cotter pins 26 are extended through the housing and said lugs 24:, as shown, to hold said parts together removably.

It will be noted that the upper and lower bearing blocks are easily removable when necessity arises for repair or replacement of the bearings. The upper block is released by taking out the key 18 and pulling out on The lower bearing the-cotter pins slightly in an the cup or handle 17 is removed by withdrawing 26 and raising the block 23 obvious manner.

The construction thus produced is cheap and economical to manufacture and easily and quickly assembled. The oil cup 15 makes it easy to lubricate efliciently. The further objects and advantages will be obvious to one srilled in the art without further description.

WVhat I claim as new is:

Ina pitman, a head, a bearing housing formed transversely through said head, upper and lower bearing blocks therein, said upper block being adjustable, downwardly extending lugs at each end of said lower A lateral and within a slot 20in the Said block 23 has end lugs iii-i) block, and cotter pins extending through said lugs and said housing.

In testimony whereof I hereunto affix my signature this 10th day of June, A. D. 1924i.

BURWELL BOYKIN, JR. 

